Panelized suspended roof for reverberatory furnace

ABSTRACT

A furnace roof of basic or magnesite-chrome refractory tile is provided whose members are assembled in banded bundles and are carried by overhead metal panel frames or sections of two types, one called a primary type is cantilevered from an associated Ibeam and the other called a secondary type is suspended or cantilevered or piggy-back mounted on a pair of longitudinally spaced-apart panels of the first type. Tile of the bundles are metal-clad in an improved manner as a bundle and for hot patching are provided with a sandwich or assembly of asbestos and metal plate members. Upper reaches of the tile members are sealed-off from charging spillage and dust that may be recovered for use in the furnace; air cooling is facilitated.

United States Patent [72] Inventor Levi S. Longenecker 61 Mayfair Drive.Pittsburgh, Pa 15228 [21] Appl No. 842,918 [22] Filed July 18,1969 [451Patented June 29, 1971 [54] PANELIZED SUSPENDED ROOF FOR REVERBERATORYFURNACE 17 Claims, 29 Drawing Figs.

[52] U.S.Cl 110/99 [51] Int. Cl F23m 5/02 [50] Field of Search 110/99.180

[56} References Cited UNITED STATES PATENTS 1,477,895 12/1923Poppenhusen 1 10/99 -3,252,436 5/1966 Hall 110/99 3,338,016 8/1967Bailey 1l0/99X 3,340,832 9/1967 Grigsby 1, 3,375,795 4/1968 MerklePrimary Examiner- Edward G. Favors Atmrne \'-Greer1.McCalliStcr andMiller ABSTRACT: A furnace roof of basic or magnesite-chrome refractorytile is provided whose members are assembled in banded bundles and arecarried by overhead metal panel frames or sections of two types, onecalled a primary type is cantilevered from an associated l-beam and theother called a secondary type is suspended or cantilevered or piggy-backmounted on a pair of longitudinally spaced-apart panels of the firsttype. Tile of the bundles are metal-clad in an improved manner as abundle and for hot patching are provided with a sandwich or assembly ofasbestos and metal plate members. Upper reaches of the tile members aresealed-off from charging spillage and dust that may be recovered for usein the fur- 1 nace; air cooling is facilitated.

III

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SHEET 9 0F 9 /N l/[f/V l'OR Law 5. Longenecker HIS ATTORNEYS PANIELIZIEDSUSPENDED llllGGlF lFOllt IREVIBFIBIERATORY FIUIIRNACIE The inventiondeals with constructing a new and improved roof suitable forreverberatory furnaces such as used in the refining of copper metal andparticularly, with the provision of a roof construction that willfacilitate initial construction, cold and hot patching, air cooling, andsegregation and collection of dust and spilled charging materials. Aconstruction of the invention is particularly suitable where an overheadcrane or hoist is available.

A phase of the invention deals with new and improved procedure forbundling or assembling refractory tile members, from the standpoint ofmetal cladding usage, from the stand point of palletizing them forshipment and assembly, from the standpoint of employing them in a panelassembly, and from the standpoint of employing them in roof patchingoperations.

Over a period of years it has been customary to utilize socalled silicarefractory tile or brick as a suspended roof for reverberatory copperfurnace utilization and to apply silica slurry daily to maintain theroof and provide it with a reasonable operating life. Charging materialswhich may be in the form of a slurry or dried particles areconventionally fed by a continuous conveyor through feed piping, chutesor ducts into the furnace; spilled materials and dust quickly accumulateon the top of the roof which must be promptly removed by daily cleaning,as by the application of compressed air through lances. Accumulatedmaterial tends to insulate the top of the tile and to thus concentratethe heat; this increases the tendency to burnout brick or tile membersas well as the hanger castings from which they are suspended. It isimportant to promptly blow off this material, since if it builds up to athickness of onehalf to three-fourths inches it tends to pack andharden, making removal difficult if not impossible without damage to theupper ends of the brick or tile members.

Recently there has been a trend towards the use of so'called basic tilesuspended roofconstructions and to the use ofa roof which at least has apart of its construction panelized in order to provide it with a betterperiod of life and enable the use of higher operating temperatures.Attendant with the use of such an improved type of tile has been theneed for facilitating the repair of damaged areas of the roof, withoutshutting-down the operation of the furnace, without damaging adjacentportions of the roof, and with a minimized discomfort and risk tomaintenance personnel. In this connection, panelized assemblies havebeen found to be advantageous but heretofore have been limited to mainor central portions of the furnace roof, with the remaining portionssuch as the sloped sides, those portions about the charging ducts, etc.,requiring individual handling, installation and repair.

There has thus been a need for an improved basic roof construction thatwill facilitate a substantially full panelization of the structure, andwill enable tile and associated hangers to be assembled on a pallet atthe refractory plant with corrugated expansion plates in such a mannerand arrangement that flexi bility of assembly and patching is assured atthe plant site.

The need has also been for a construction which in its panelization willfacilitate cooling the tile roof and the clean' ing-ff of spillage anddust that are normally incident to the operation ofa reverberatoryfurnace.

It has thus been an object of the invention to devise a new and improvedprocedural approach to the installation and repairing of a basic rooffor a reverberatory furnace;

Another object has been to devise a new and improved roof constructionand assembly whereby substantially full panelizing of the roof from thestandpoint of tile bundles and associated overhead structural supportassemblies can be utilized throughout, with an attendant improvement inefficiency and life ofthe structure;

Another object of the invention has been to devise a panelized roofconstruction which utilizes two types of panel units that areinterfitting and which facilitates the insertion and removal of panels,not only in initially assembling the roof, but also in a localizedmanner in repairing the roof;

A further object of the invention has been to provide a new approach tothe bundling and cladding of refractory tile members as suspended fromassociated hangers for both cold and hot patching operations;

A still further object of the invention has been to provide means in aroof construction for holding down an adjacent or perimeter tile areawhile removing burned out panel as a unit by pulling it out of positionwith the crane;

These and other objects of the invention will appear to those skilled inthe art from the illustrated embodiments and the claims.

In the drawings,

FIG. l is a transverse side section in elevation of a furnace roofconstructed in accordance with the invention.

FIG. 2 is a plan fragmental view taken transversely of the roof on thescale of and of the structure of FIG. ll showing supporting metal oroverhead steel structure.

FIG. 3 is a horizontal section taken longitudinally of the roof,partially broken away, and on the line III-III of FIG. I; this viewparticularly illustrated panel structure and cooling air flow providedabove refractory tile.

FIG. 4 is a longitudinal section in elevation on the scale of FIG. 3 andshowing basic construction of the roof.

FIG. 5 is a longitudinal section in elevation on the scale of and of thestructure of FIG. 4, showing the metal support structure in somewhat ofan exploded relation to particularly illustrate procedure of assemblyand disassembly.

FIG. 6 is an enlarged fragmental longitudinal section in elevation takenthrough a central portion of the roof, particularly illustrating coverplate and baffle means, etc. for controlling cooling air flow, and alsoillustrating an assembly of a type adapted for hand installation (whereno hoist is available).

FIG. '7 is an enlarged front or wide side elevation showing two two-tilebundles, each having a hanger casting part, with one part beingsupported or carried by the other or primary part through the employmentof a latching relation therebetween; in this view refractory tilemembers are shown provided with metal separator plates and outer metalcladding.

FIG. 8 is an end elevation on the scale of and of the tile group orassembly of FIG. 7.

FIG. 9 is an end elevation on the scale of and of the bundle of FIG. 8with separator plates but without outer metal cladding.

FIG. It} is a front or wide side elevation on the scale of and similarto FIG. 7, but illustrating a four-tile bundle; like FIG. 7 this viewshows a metal sheathed or clad tile bundle.

FIG. 11 is an end elevation on the scale of and of the construction ofFIG. 110.

FIG. 12 is a front or wide side view in elevation of a six-tile memberbundle on the scale of FIGS. 7' and I0 and showing a modified two-partform of hanger casting assembly.

FIG. 13 is an end elevation on the scale of and of the con struction ofFIG. 12.

FIG. 14 is a horizontal section on the scale of and taken along the lineXIV-XIV of FIG. 12.

FIG. i5 is an isometric view in elevation ofa refractory tile or blockmember that may be used in the structure of the invention.

FIG. 16 is an isometric elevation on the scale of FIG. 15 illustratingan angle-shaped outer metal plate or cladding member, and

FIG. 17 is a similar view of an inner, separator plate or claddingmember, such as may be used in forming tile bundles illustrated in FIGS.7 to 15.

FIG. 18 is a fragmental plan view illustrating palletizing of tilebundles that may be accomplished by the tile manufacturer beforeshipment to the construction site; for clarity, the hanger castingswhich are also installed in the assembly of tile bundles at the factoryare omitted.

FIG. 18A is a side view in elevation on the scale of FIG. 18 showingpallet assemblies with hanger castings inserted;

serted in the same manner.

FIG. is a plan view on the scale of FIGS. 18 and 19, taken transverselyof the roof'and illustrating support of refractory panels or assembliesby metal channels.

FIG. 21 is a transverse side view in elevation on the scale of FIG. 19and illustrating how a panel section may be replaced in the furnace.

FIG. 22 is an end view, longitudinally of the roof, on the scale of andof the structure shown in FIG. 21 which shows hold down wedges and pipe.

FIG. 23 is a wide side view in elevation illustrating a hot patchingtile bundle assembly constructed in accordance with the invention.

FIG. 24 is an end view in elevation on the scale of and of theconstruction of FIG. 23.

, FIGS. 25 through 23 are isometric views in elevation illustratingasbestos and metal parts used in assembling the bundies of FIGS. 23 and24.

FIGS. 25 and 26 represent asbestos angle-shaped cladding members andFIGS. 27 and 28 represent metal cladding members of U and boxlikeshapes.

In carrying out the invention, refractory tile or brick membcrs'30 mayfirst be preliminarily assembled in bundles and banded with hangercastings, and then reassembled on pallets in the form of palletizedassemblies or groups (see pallets C and C of FIG. 18) for storage,shipment, handling and roof mounting. Roof assembly or installation isaccomplished by utilizing two forms or panel types of structural metaloverhead support or frame structures. One structural panel, termed asecondary panel B, is to be first removed before repair is made to theother or primary panel A or to its suspended tile assembly. In buildingthe roof, longitudinally spaced-apart primary panels A of two-partconstruction are first mounted in place and each secondary panel B isthen mounted piggy-back to rest at its ends on a pair ofthe primarypanels A. Each overhead structural member panel or panel assembly isadapted to be slid, lowered and lifted into and out of position withrespect to transverse or cross-extending overhead, main beam or girdermembers 10. The mounting is such that steel longitudlnally extendingcover or sealing plate members 70 (see FIGS. 1, 4 and 6) may be readilyutilized to not only close off upper reaches of tile members 30 andtheir hanger castings from dust and spillage collection, but also toenable cooling air to be circulated in an etfleicnt manner below theplate members 7.0, along hanger castings, generally designated as 2.24,and upper ends or reaches of the refractory tile or brick members Afurnace roof using magnesito-chrome or basic type tile is shown made upof intcrfltting panel sections employing supporting framework andhunger-mounted, banded bundles of tile members suspended therefrom, allin such a manner that a panellzed construction may be used substantiallythroughout the full extent of the roof, cold assembly and repair and hotpatching are facilitated, the provision of cooling ducts above the tilemembers is facilitated, upper reaches of the tile members may bescaled=off from spillage olcharging materials and dust that may berecovered for use in the furnace.

Referring to the drawings, the roof is supported by cross-extendinggirders or l=bcam members it) (see FiGS. i to d) that have alongitudinally spacod=spnrt relation with each other. The metal roofframe or steel support structure employs socalled end, primary orsupporting panel sections A which cooperate with and have csntllcvcrchannel members 32 rest= lng endwisc on lower flanges of the crossgirders or beams iii. Plate members or pieces ii are weldoccurcd alongthe web and between the flanges of the girders it) in the form of pairsprovided as spacod=spart members to reinforce the cross gin dcrs iil anddefine receiving and alignment compartments or pockets for end portionsotlongltudinnily extending. cantilever members i2 which may be boltedthereto. intermediate or secondary panel sections B have longitudinallyextending upper structural channel members 22 (seenFIG. 4) that restpiggy-back at their ends on adjacent vertical or upright channel memberlegs I3 of the primary or main panels A.

Each part of each two-part panel A has, as shown particularly in FIGS. land 4, a pair of spaced-apart upright or vertical channel members 13which are integrally connected adjacent their upper ends bycross-extending horizontal tie members I4 of an I-web and bottom flangeconstruction to rest on a pair of spaced-apart, longitudinallyhorizontally extending, cantilever channel members 12. Cantilevermembers 12 are adapted, as shown in FIG. 4, to'removably rest upon alower flange 10a of an associated cross girder or beam 10. The verticalor leg members 13 of each part of panel A are provided with an upwardlyopen, horizontally, cross-extending, support and connecting lowerchannel 15 which is integrally secured thereto as a foot for themetalwork thereof. Opposite flanges of each connecting channel 15 areadapted to serve as receiving edges for gooseneck portions of tilesuspending hangers or hanger castings, generally designated as 24.

Each central or secondary panel B has a pair of longitudinallyspaced-apart, upright or vertical channel member legs 20 that aresecured adjacent their upper end portions in a reinforced manner byangle members or pieces 21 to a pair of transversely spaced-apart,horizontal, longitudinally extending, channel members 22. Opposite endsof the channel members 22 of each panel B, as shown particularly in FIG.4, are adapted to rest in a cantilevered manner on upper ends ofvertical leg members 13 and the connector members I4 ofa pair oflongitudinally spaced-apart adjacent panels A for support thereon andthus, for indirect support on girders I0 through the agency ofa pair ofopposite end-positioned panels A. Each secondary panel B has a pair oftransversely spaced-apart frame members that at the lower ends of theirlegs 20 are integrally secured to a transversely or cross-extendingupwardly facing, hanger casting supporting, channel member 25 (see FIGS.1 and 4). The channel members 25, like the members 15 of panels A, serveas a mounting or supporting means for gooseneck hooks of the hangercastings, generally designated as 24-.

The above construction, with notched girder ends, allows the roof to beinstalled at the highest possible elevation to obtain maximum bank areaand, at the same time, to provide sufficient space for repair and othermaintenance work. As shown particularly from FIGS. 1, 3 and d, the roofof the present construction is completely panelized, including the areaunder the cross girders iii) and around feeder pipes or ducts. As aresult, the entire roof can now be installed, replaced and repaired withan overhead crane and 'its hoist, except possibly for a couple ofbundles of hand-mounted tiles used behind feeder pipes or ducts. Thecentral panel B may be approximately 4 by 4 feet and the end panels Amay be about 4 by 2 feet.

Basic refractory tile or block members 30 are hung from the upturnedflange or leg portions ofthe connecting, bottom support channels I5 and25. The tile 30 are assembled as shown in FIGS. 7 to M in bundles thatmay be held together by steel bands S after assembly. Such bundles maybe in the form of six tiles, four tiles or two tiles, with the two tilearrangement is of FIGS. '7 and 8 being preferred where the tiles 3d areto be placed in the form of a panel assembly or section by hand ratherthan by the use of the overhead crane hoist. A casting on castingassembly 35, 36 such as illustrated in FIGS. 6, 7 and '3 is adaptablefor hand patching and personal access. A portable patching rig orplatform with windlass may also be used for roof construction and repairwork. in the two bundle assembly shown in FIGS. 7 and 8, the tilemembers 30 are assembled with secondary hanger part 36 of one castingassembly engaging and being cantile ered or suspended from a primaryhanger part 35. in other words, the tile members 30 in a banded, twotile bundle E or assembly are, in effect, cooperatively mounted withrespect to each other in such a manner that one transverse row of tilemembers 3t) may be hooked in position over a second transverse rowthrough the agency of their respective cooperating hanger castings Jilland 36.

FIGS. lit) and Ill show a four tile bundle having a single type ofhanger casting 37. In the six tile bundle of FIGS. l2 to I4, :1 largercasting Elli is shown which may be provided with a separate, removablymounted gooseneck hook 359. This type of casting may be used where it isimpractical to form a hook on a larger size casting, or if the length ofthe gooseneck is to be extended or is to be varied for different furnaceinstallations. As shown in FIGS. l2 and IF, the hanger casting 3% has aprojecting lug Ella which fits within a complementary hole in thegooseneck part SW, and has an opening adjacent its lower end throughwhich a nut and bolt assembly ill may extend to provide a secure,removable mounting on the hanger casting 38.

FIG. llll of the drawings illustrates how refractory tile or blockmembers may be assembled in an upright-positioned relation on a pallet Cor C in a group assembly that is compatible with a final desired hangerassembly for storage and shipment to the place of installation of theroof. At the factory, the tile members will be assembled in bundles on alevel surface with the slot portions of tile pairs being matched, hangercastings will be inserted, metal reinforcing plates will be added, thebundles will be banded, and then the banded bundles will be assembled ona pallet with longitudinally and transversely extending expansion platesI5 and lb inserted. As indicated in FIG. 118A, opposed pairs of inturnedhangers 24 provide a cross-extending tile row group to, at the place ofroof installation receive a common support channel see, for example,FIG. 19. At the place of roof installation, a pair of pallets C and Cmay, as indicated by the arrows oIFIG. Iii, be moved into endwiseabutment and a longitudinal expansion plate ib inserted between a tilerow of one pallet (I and an adjacent tile row ofthe other pallet C toprovide a desired width of assembly for installation. For example, anadditional transverse expansion plate lb inserted between may beinserted between adjacent tile rows of a pair of pallets C and C at theplace of roof installation to provide about a 4 foot by 4 foot assembly, assuming that each pallet supports a i by 3 foot as sembly.

I prefer to employ corrugated metal expansion plates 45 and 46 at about2 foot intervals in each direction; the corrugations should extendhorizontally to enable sealing off the cooling air flow. FIG. l9illustrates how pallets C may be used at the place of installation forpanel structure insertion. The hanger castings generally designated as24 have been inserted at the brick plant with their feet in the upperend slots of the tile members Elli before banding into bundles of adesired longitudinal extent and of two tile widths or transverse extent.lEach bundle is banded by a steel tie S which may consist of strap metalwelded at its ends. Thence, a panel frame B or a panel frame part ofrepresentative frame A, may be inserted or moved endwise until itsbottom channel 25 or ill receives the generally designated hangers 2 5of the assembled group of hangers. The hangers interlatch along opposedupright side flanges of the channel member 25 or IE5, see the arrow ofFIG. 19, see also FIG. and the ultimate panel assembly represented inFIGS. 4 and 6.

Referring particularly to FIG. 5, I have somewhat diagrammaticallyillustrated how the panel sections A, b, may in a step-by-step manner beassembled with respect to each other to form a completed furnace roof. Apair of opposed, shortlength, horizontal cantilever members l2 are movedendwise into an opposed aligned relation on the bottom flange Illa of anassociated girder It) and are secured as by bolting them to reinforcingpieces ll thereof. An upright rectangular frame part, made up or a pairof upright leg members l3 and an upper, longitudinally extending,horizontal connecting member I4 and a suspended, integrally securedchannel member l5, see FIG. 19, is provided with an assembly of tilemembers 30 as suspended by hangers 24. This frame part and tile assemblyis then moved endwise into a final position such as further illustratedin FIGS. ll, 3 and i, at which time the cross member l4 of each framepart of panel A rests upon and is suspended from the upper flange of anassociated cantilever member l2.

Appropriate metal framework channels 15 or 25 for the panels A or B maybe slid endwise into position along the bangers (see the arrow of FIG.19) in such a manner that the hanger will then be suspended fromassociated channel support member IE or 25. At this time, a hoist D ofan overhead crane may be secured as indicated in FIG. 19 to a central,horizontal, longitudinally extending member, for example 14, to lifteach part of panel A into an overhead position in alignment with thespace to be filled. The hoist D may also be used to lower panel B to apiggy-back mounted position on the pair of previously mounted side orend panels A.

After the outer part assemblies of A have been moved into the finalsuspended position of FIG. 5, then the inner panel as semblies of A aremoved in the same manner (see the arrow) into a suspended positionillustrated in FIG. 4. At this time, a pair of tile assemblies of panelB whose hangers have been in troduced endwise along foot channels 25, isthen lowered (see the arrow) into a cantilevered, supported position onthe panel assemblies A, as illustrated in FIGS. tand 5. To ready theroof for repair, the above-explained procedure may be reversed.

In FIGS. 2?! and 222, I have shown a removable wedge and pipe or rodtype of holddown which can be used to securely lock tile bundles E on apanel for safe handling; the holddown assembly may also be employed tobrace perimeter edges around a patching hole when an existing panel isto be pulledout for repair. Vertical upright or leg members 113 of thepanels A are shown provided with a cross opening or hole 13a therein,and the upright or leg members 20 of the panels B (see FIG. 4), with across opening 20a therein to removably receive a pipe or rod 50 whichwill extend between pairs of upright members l3 or 20 that carryintegral bottom channels IE3 or 25 transversely of the furnace; thesechannels carry the hangers 224i in a suspended relation therefrom. Whenspeaking of a channel, I have reference to a channel-shaped memberconstruction. Wedge blocks 51 may be driven in between the hook portionsof the hangers 24 and the cross-extending pipe or rod 50 to preventaccidental release of the hangers from the channel I5 when, for example,the roof is being patched, and particularly when a panel or section A orBis being handled by the hoist D of an overhead crane. Afterinstallation has been completed, the wedges fill may be knocked-out andthe crossextending pipe or rod members 540 may be removed.

The holddown construction illustrated in FIGS. 21 and 22 may also beused in accomplishing an original installation, in that it serves tolock the tile and hangers in place on a metal panel structure, in orderthat none of the tile or castings can be knocked off during handling. Itis particularly advantageous during cold or hot patching in that it canbe used with panels surrounding the hole or portion to be patched tohold their tile members in place.

Present practice of using, in alternate fashion, plated and unplatedtile, causes a considerable variation in size when assembled intopanels. It is thus practically impossible to get a plated and unplatedtile to the same uniform size that will make them a good matching pair.It is proposed to group unplated tiles in bundles of two, four or sixmembers, with these bundles being equipped with loose internal separatortype plates 55 (see FIGS. 7, b, M and I7), and in an initial or coldpatch installation to apply angle-shaped outside plate members 57 (seealso FIG. 116). The plate members 57 will have one wing, upright sideface or panel portion 570 of a width or horizontal extent correspondingto the width dimension of the wide side face of an associated tilemember (see FIG. 14). Its other panel or plate wing portion 57c willhave a width or horizontal extent corresponding to the total width ofthe end assembly of the tile which is to be banded; as shown, the widthwill constitute the endwise-width extent of two associated tile Bill ofa bundle. Thus, one separator plate 55 and one outer angle-shaped plate57 serves to provide coverage for each pair of tile members 30; oneplate 57 is used for each joint. The one exposed wide side face and theone exposed end side face of the bundle of FIG. M is, in effect, coveredby the plates 57 of an associated bundle to provide a metal-enclosedassembly.

In accomplishing roof construction and patching employing the structureof the present invention, refractory tile tile block members 30 aregrouped in a suitable manner and banded. As shown in FIGS. I and 14,tile members 30 are formed in a bundle E with a pair of membersproviding the narrow-dimension, as separated on the adjacent wide sidefaces by a metal separator plate member 55; two or more tile members 30may be used in each bundle as held together by the continuous steel bandor ribbon S (see FIG. 12). Top tabs 55a on separator plates 55 and toptabs 57h on the outer angle plates 57 are adapted to rest on upper endfaces of tile members 30 of the bundle to aid in properly positioningand retaining them in a positioned relation. Bundles of two, four or sixtile bundles may be provided in the above manner with metal sheathing.

Where hot patching is to be accomplished, I contemplate removing atleast a section of tile members or a panel and corrugated expansionmembers 45 and 46 so as to provide sufficient spacing for the insertionof the hot patch tile assembly. It is important in this connection toprovide a hole size somewhat larger than the patching unit. This isespecially important when the panels are to be maneuvered into placewith an overhead crane. Referring to FIG. 4, a group assembly B of tilemember groups or rows 47 that are supported on or suspended from a pairof channel members (such as 25) may be removed, as indicated in FIG. 5,followed by pulling out two groups 47 (see FIG. 4), as indicated at A ofFIG. 5, to provide a patching hole. Of course, exposed immediateexpansion plates 45 and 46 are removed. In the drawings 47 designates analigned row or group of cooperating tile members that are suspended froma common support channel 15 or 25.

To provide a heat shield where hot patching is being employed, anasbestos enclosure is used (see FIGS. 23 to 28) that is made up ofa pairof end pieces 60 having bottom extending tabs or flaps 60a, and of wideside pieces 61 having bottom tabs or flaps 61a. This provides anasbestos cover for all four sides of each hot patch bundle F that has adouble thickness at its bottom face (see FIG. 23). A U'shaped upwardlyprojecting metal cladding piece 62, such as of stainless steel, enclosesthe bottom face and the side narrow faces of the tile assembly orbundle, and a second U-shaped or boxlike rectangular metal member orpart 63 covers the wide faces and the bottom face and has top tabs 630that book over the top face of the tile members of the assembly F. Hotpatch assembly or bundle F is also bound with a steel strap S and willbe installed without corrugated expansion plates, since the asbestospieces will decompose and provide thermal expansion space for the newtile assembly.

The upper flaps of both the banded cold assemblies E and the hotassemblies F serve to provide an additional reinforcement of the tile intheir mounted relationship, since such flaps or flanges extend above andalong the slotted portions which receive the feet of the hanger castingsfrom which they are suspended. The steel band or strap member is usedafter each bundle has been completed for holding it in a bandedrelationship. Since the bundles are to be assembled in an adjacentrelation, the steel band 5 on each bundle is staggered with respect tothe bands of adjacent bundles as shown in FIG. 19.

Referring TO FIG. 4, the cross-extending l-beams or girders may have an8 foot spacing with respect to each other longitudinally of thesuspended roof. The tile 30 are shown suspended in a two row, l2 inchwide band arrangement with four tile to the band. This presents a weightof about 132 lbs. per bundle. Each hanger casting or assembly 24supports a bundle E and is hung in a facing and matching relation fromopposite sides of the channels or 25, with the refractory parting linebetween the central bundles of panels A extending under and along acenterline of the associated cross girder 10.

The dual hanger assembly in FIGS. 7 to 9, inclusive, is particularlysuited for an installation where no overhead crane is available and thetile and hangers are to be installed by hand. See particularly FIG. 6.In a roof construction for this purpose, a casting carrying two rows oftile, as indicated in FIG. 4, will be paired-off with a two row castingassembly, such as shown in FIG. 7, wherein each casting part is of asingle tile row supporting construction. For manual installation andrepair, a construction such as illustrated in FIG. 6 has been employedto give sufficient operating room, to facilitate shifting steel supportsfor access, and to enable such tile units as l and 2 to be separatelyremoved and inserted. In FIG. 6, prime affixes have been employed todesignated members that correspond to those of the embodimentrepresented by FIG. 4, but that have been slightly modified for manualas distinguished from hoist or crane installation procedure.

By closingoff the upper reaches of the tile members 30 of the roof withsteel cover plates 70, high velocity cooling air may be utilized forincreasing the operating life of the steel framework as well as of therefractory tile. In this connection, metal or steel cover plate members(see FIGS. 1 and 4) are removably positioned to rest in horizontalpositions above the upper sides of hanger castings generally designatedas 24. The members 70 have, as shown, turned-down end or side portionsthat project downwardly to set or rest on the channels l5 and 25 betweentheir flanges and upright members l3 and 20 to provide an effectivesealing-off relation for the cooling air flow. The members are alsoshown provided with central, downwardly extending or vertical baffieportions 71 (see also FIGS. 4! and 6) that extend down to the upper faceof the tile in alignment with the separation line between a longitudinalrow of tile members 30, see FIGS. 3 and 4. In addition to materiallyincreasing the life of the group, this will eliminate the daily task ofblowing the roof clean. In FIG. 3, I have shown a pair of cooling airinlet and outlet header pairs or mains 75a and 760 that are connected bytransverse secondary lines 75 and 76 to roof inlet and outlet ports. Ihave shown each 8 foot length of roof between girders 10 as equippedwith four air inlets 75, two on each side, and four straight-line airoutlets 76, one for each opposite side inlet 75; it will be noted thatthe inlet and outlets 75 and 76 are alternatively positioned along eachside of the roof to provide adjacent cooling fluid or air flow passagethat is in opposite directions across the roof. Each inlet port 75 (seeFIGS. I and 3) may be supplied with, for example, 2000 c.m.f. of air ata pressure of 6 inches W.G. which provides a total of about 8,000 c.m.f.for each 8 foot length of roof. Baffles 7B are positioned so as to forcethe incoming air from one side port 75 to flow across the roof through awell defined duct and to exhaust through exhaust port 76 on the oppositeside between two adjacent inlet ports 75. Thus, each 8 foot by 30 footsection or 240 square feet of roof may be completely covered and cooledby four blanket type air streams.

Members 71 are positioned so that they can extend downwardly in thespace between tile bundles at the expansion joint thereof. They alsoextend to said walls 72 to provide separate crossflow passageways orcompartments for the cooling air flow. All, or only the central hottestarea of the roof construction may be cooled and a multifan set forsupplying the air to the mains or headers 75a has been found to bepreferable to a single fan supply.

The plate members it? will preferably, as shown, extend over the majorarea of the furnace roof, not only as cover plates for the flow ofcooling air, but also to facilitate the collection and removal of dirt,dust and debris which normally accumulates along the upper side of areverberatory furnace roof. Referring particularly to FIGS. i and 2, aconventional feed conveyor 80 is shown for supplying lime or othersuitable furnace feed materials through a chute or hopper 8K andfettling openings 33 into the furnace. A cover apron of platelike steelmetal construction is shown positioned to form an extension of the coverplate members 70 across an air outlet opening to feed dust, etc.,collected into the upper end of a vertically downwardly extending dusthopper 86. The hopper 86 may, as shown, deliver the dust and debris, asscraped from the top of the members 70 and 85, into a collecting car orbin 87. Thus, the debris may be used as charge material by periodicallydumping it on the feed conveyor 80.

The suspension used in the construction fully meets the unique operatingrequirements of a copper reverberatory furnace. It will be noted thatthe intermediate roof supporting steel structure is located below thetop flange of the cross girders 10 in such a manner as to clear allwalkways and platforms. It is ofa stiff-leg design that places a seriesof rigid support channels within a reasonable working distance of theroof tile, and the spacing of the steel legs allows ample walkwayclearance, both transversely and lengthwise of the furnace. Thesupporting steel in the form of panels or assembly sections enables thesuspended roof to be installed or patched with a small 10 ton overheadcrane. Where a crane is not available but a portable rig is,installation and patching can be accom plished in bundles such asrepresented by E of FIG. 12. Such bundles can be handled with a portablepatching rig having a hand-cranked Windlass mounted on top of the roofsteel or bundles E of FIG. 7 may be handled by hand if no rig isavailable. The bundles may be delivered to the patching area by a rollerconveyor located under the patching rig. An area representing one-halfof the roof between girders I0 and four bundles transversely across thefurnace can be prepared without moving the rig which may then be slidskid-fashion to cover the remaining half of the area. With reference toFIG. 6, if a hand or manual type of roof repair is to be accomplished,it is necessary to shift the lefthand steel over to get a tile groupunder a girder 10.

A pullout type ofdismantling roof area that is to be replaced is nowpractical utilizing the structure disclosed; hanger castings can besalvaged and the amount of debris that is dumped into the furnaceminimized.

FIGS. 14 through 17, inclusive, illustrate with FIGS. 18 and 19, aprocedure for effecting an original roof installation, as well as forcold patching which involves the use of a metal or steel separator plate55 and an angle plate 57 for each pair of tile, which pairs areassembled into tile bundles. Hangers are inserted in the bundles and thebundles are banded by a steel metal strap or rib member S. Each bundleis then assembled with adjacent bundles on a pallet with metal or steellongitudinal and transverse corrugated expansion plates or members 45 or46 being employed about every 2 feet both ways, see for example FIG. 18.The pallet assembly is then handled as a unit in storage and shipping tothe place of roof installation and may be used with an adjacent palletto provide a final desired size of roof assembly for installation. Inthis connection, if each pallet has a length of 4 feet and a transverseextent of 3 feet, then an additional tile row taken from an adjacentpallet C may be assembled with the assembly of particular pallet C, witha suitable corrugated expansion member 46 being inserted therebetween.

The assembly as thus made available by a pair of pallets, may then belifted by an overhead crane or hoist and moved to a suitable overheaddelivery position at which the assembly may then be mounted in a mannersuch as illustrated in FIG. 19 by supporting steel channels throughaligning hangers. When this has been completed to provide each line orrow of hangers with an assembled suspended positioning on an associatedoverhead channel, then the entire assembly may be lowered into positionin the roof where it is to be mounted.

Where hot patching is to be accomplished, the expansion plates 45 and 46are no longer necessary and tile member bundles F are formed asillustrated in FIGS. 23 to 28, inclusive, by the use of asbestos andsteel sheathing or enclosing part assemblies. The bundles may then beassembled in bundle groups, such as previously illustrated anddescribed, and preferably in locked hanger groups as shown in FIGS. 21and 22, but with the expansion plate members 45 and 46 omitted. Theasbestos portions of each bundle F serve to provide for expansion afterthe installation has been completed, in that the asbestos material issoft and also tends to disintegrate under the heat to which the roof issubjected. The procedure of the present invention greatly simplifies theinitial installation of and the repair or replacement of a furnace roof.Further storage at and shipment from the refractory plant is simplified,maximum assembly is accomplished at the factory, panel steel mounting issimplified at the place of installation, and handling and mounting issimplified at the place of installation. Finally, effective andefficient tile assembly sizes for storage, shipment, handling andinstallation are made practical.

As shown in FIGS. 1 and 4, a panel assembly or group of tile members 47may include a pair of longitudinally extending expansion plates such as45 and a transversely extending expansion plate such as 46, and ishandled with inner expansion plates in position. The tile members arecarried in an aligned row by the hanger castings, see the representativecastings 35, 36 of FIG. 7, 38 of FIG. 12, and 24 as generally designatedin FIGS. 21 and 22. As shown in FIG. 22, each row may have a pair of rowparts, represented by E, with the hanger castings 24 ofone part andinserted reinforcing metal plates or separating side and bottom metalplates or sheathing being secured in position by banding the groupassemblies of the tile members together. It will be noted that thehangers of one row part face in one direction and are in an opposed andaligned relationship with the hangers of the other row part of the samepair to latch-engage over the side flanges of a common associatedchannel-shaped support member 15 (or 25), see also FIG. 5.

lclaim:

I. In a method of providing a suspended roof construction, assembling atleast a pair of slotted refractory tile members in an aligned positionwith respect to each other, inserting a hanger casting in the slots ofthe aligned tile members to project therefrom, inserting loose metalreinforcing plates between the aligned tile members, banding the alignedtile members as a group together with the petal plates in position andwith the associated hanger casting within the slots to form a secureassembly, and providing asbestos members between the tile members andthe metal plates before banding the tile members together as a group.

2. In a method of providing a suspended roof construction, assemblingslotted refractory tile members with their slotted portions in acooperating relation with respect to each other, inserting hangercastings within cooperating slotted portions of the assembled tilemembers to project endwise therefrom, inserting loose metal reinforcingplates between the assembled tile members, banding assembled tilemembers together in the form ofgroups with the metal plates and thehanger castings in position to form secure assemblies, and employing anexpansion-permitting means by applying an asbestos sheathing and anouter meta] enclosure about each banded group of tile members beforebanding the group and assembling it on the pallet.

3. In a panelized suspended roof construction for removable mountingbetween an adjacent pair of spaced-apart overhead girders, metalhangers, aligned rows of hanger-supported refractory tile members,reinforcing metal plates between the tile members of said rows, meansbanding groups of the tile members of said rows together with. saidmetal plates in a secure position therebetween, metal support memberscooperating with said hangers to removably suspend said rows between thegirders, said plate members having members along side and bottomportions of the tile members of said banded groups, and asbestossheathing between said plate members and side and bottom portions oftile members of said banded groups.

4. In a panelized suspended roof construction for removable mountingbetween an adjacent pair of spaced-apart cross-extending overheadgirders, a pair of longitudinally spaced-apart primary panels and anintermediate secondary panel of metalsupported and suspended refractorytile members; each primary panel being of similar construction and beingsuspended from an associated one of the girders; each primary panelhaving a two-part construction, each part of which has transverselyextending rows of hanger-mounted refractory tile members suspended froma transversely extending channel member, each part also having avertically upwardly and horizontally inwardly projecting metalsupporting frame secured to said channel member, said supporting frameof one part of said pair being adapted to extend towards the associatedgirder and to removably rest upon an adjacent bottom flange and extendfrom one side of the rib thereof, said supporting frame of the otherpart of the same pair being adapted to extend towards and rest upon anadjacent bottom flange of the same associated girder from an oppositeside of its rib and in an opposed relation with respect to saidfirst-mentioned frame; said secondary panel having transverselyextending rows of hanger-mounted refractory tile members suspended fromspaced-apart transversely extending channels and having an overheadmetal frame that is secured to and projects upwardly from the channelsand that projects horizontally outwardly at an upper level to rest uponsaid pair of primary panels that are located at opposite ends of saidsecondary panel and suspended from the pair of spaced-apart girders.

5. In a roof as defined in claim 4, said overhead metalframe of saidsecondary panel having at least a pair of spaced-apart horizontallyextending overhead support members that are connected by spaced-apartvertical leg members to the channels of each of the rows ofsad secondarypanel.

6. In a panelized suspended roof construction for removable mounting onan adjacent pair of longitudinally spaced-apart cross-extending overheadgirders, a pair of spaced-apart end panels comprising hanger-suspendedrefractory tile member rows, each end panel of said pair being inalignment with and supported on an associated one of the girders, anintermediate panel having hanger-suspended refractory tile member rowscarried by vertical upright members and horizontally extending membersthat define a supporting frame, said horizontal members of saidsupporting frame having end portions that are removably supported on andwith respect to the pair of cross-extending girders, said intermediatepanel having an upwardly open and horizontally extending channel foreach of its tile member rows, and the hanger castings of each tilemember row being mounted in an endwise-insertable removably suspendedrelation on an associated one of said channels.

7. In a roof construction as defined in claim 6, the vertical uprightmembers of said supporting frame of said intermediate panel beingspaced-apart upright metal members secured at their lower ends to saidhorizontal channel members, and said horizontally extending members ofsaid supporting frame being overhead longitudinally extending andspaced-apart metal suspension members to which upper ends of saidvertical upright members are secured and which at their ends aresuspended from the pair of adjacently spaced-apart girders.

8. In a panelized suspended roof construction, a plurality of refractorytile member rows in an aligned group, hanger castings suspending eachtile member row, a transversely extending channel member slidablyreceiving the hanger castings of each tile member row, an overhead metalsupport structure suspending said tile member rows in an assembledrelation, upper reaches of said hanger castings and of said channelmembers being in a substantially planar-aligned position along theconstruction, cover plate members positioned over said channel membersand said hanger castings to seal-off I upper reaches of the hangercastings and the tile members and to define a cooling air circulatingspacing between upper reaches of said hanger castings and upper reachesof said tile member rows, and means for moving cooling air beneath saidplate members along the upper reaches of said tile member rows.

9. In a panelized roof construction as defined in claim 8, meanscooperating with said cover plate members for direct ing the movingcooling air from one side of the roof construction to the opposite sidethereof.

10. In a roof construction as defined in claim 8, said plate membersbeing positioned in a relatively planar relationship I2 with respect toeach other to receive spilled dust and additives thereon for readyremoval from the construction above said hanger castings and said tilemember rows.

1]. In a roof construction as defined in claim 8, spacedapart uprightmetal members secured at their lower ends to said channel members, andoverhead horizontally extending spaced-apart suspension members securedto the upper ends of said upright metal members.

12. In a roof construction as defined in claim 11, means definingcompartments along the upper reaches of said refractory tile member rowstransversely of the construction and substantially parallel to saidchannel members, and means for introducing cooling fluid into alternatecompartments taken longitudinally of the construction from oppositesides of the construction and for removing warmed cooling fluid after ithas passed across the roof construction from alternate compartmentsalong opposite sides thereof.

13. In a quick servicing panel construction for repairing a furnaceroof, a longitudinal row ofa banded together group of refractory tilemembers having slotted upper end portions, hanger castings mounted insaid slotted portions and projecting upwardly in an aligned relationalong the row, a slide-in channel member inserted along and engaged bythe aligned hanger castings, an overhead support frame adapted to besuspended from an overhead hoist, said support frame having at least apair of spaced-apart vertical legs secured at their lower ends to saidchannel member, a cross-extending member projecting through said pair oflegs in alignment with said channel member, and wedge-shaped membersdriven between opposite end portions of said cross-extending end memberand immediately adjacent hanger castings to securely suspend said rowsfrom said support structure for transportation to and insertion withinan open portion of the roof that is to be repaired.

14 In an improved hot patching refractory tile member construction, anendwise-aligned group of upright refractory tile members having wideside faces and narrow end faces, asbestos angle-shaped members enclosingouter wide side and end faces of the group as well as bottom facesthereof, and metal sheath members enclosing said asbestos members.

15. In a construction as defined in claim 14, said asbestos memberscomprising a pair of angle-shaped side members, each having a verticalportion of a height and length substantially corresponding to the heightand length of wide sides of the group and having a horizontal bottomportion of a length and width substantially corresponding to the lengthand width of an underside of the group, and said asbestos members alsocomprising a pair of angle-shaped end members having a vertical portionof a height and width substantially corresponding to the height andwidth of narrow ends of the group and having a horizontal bottom portionof a width substantially corresponding to the width of an underside ofthe group and of a length substantially corresponding to one half thelength of the underside.

16. In a construction as defined in claim 14, said metal sheath memberscomprising a U-shaped metal member having a bottom horizontal portion ofa length and width substantially corresponding to the length and widthof an underside of the group and having vertical end portions extendingfrom ends of said horizontal portion, each having a height and widthsubstantially corresponding to the height and width of narrow ends ofthe group; and a rectangular-shaped metal member having a pair ofopposed vertical wide side portions of height and length substantiallycorresponding to the height and length of opposed wide sides of thegroup, having a horizontal bottom portion connecting bottom edges ofsaid pair of vertical wide side portions and of a length and widthsubstantially corresponding to the length and width of an underside ofthe group, and having a pair of horizontal upper tab portions connectedto upper ends of said wide side portions and of a length substantiallycorresponding to the length of an upper side of the group and of alesser width than the upper side of the group.

17. In an improved cold patching refractory tile assembly. aligned rowsof refractory tile members each of which has a pair of wide side facesand a pair of narrow end faces, each tile member having a latching slotportion at an upper end thereof, matching pairs ofthe tile membershaving their slot portions in a cooperating complementary group, eachcomplementary group of slot portions having a hanger casting mountedtherein and extending across the aligned tile rows to projectthereabove, said aligned rows comprising at least one pair of said tilemembers positioned with their adjacent wide side faces in an opposedrelation with respect to each other, vertically extending metalseparating plates of planar construction between the opposed wide sidefaces of each said pair of tile members, angle-shaped verticallyupwardly extending metal sheath members each having one side closing offnarrow end UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION PatentNo. 3 589 31 6 Dated June 29, 1 971 Inventor(s) Levi S. Longenecker Itis certified that error appears in the above-identified patent and thatsaid Letters Patent are hereby corrected as shown below:

Column 5, line 38, after "1+0" delete "inserted between line 70, change"or" to -of--.

Column 8, line 1 3 change "designated" to --designate--; line 58, change"said" to --side-.

Column 10, line 3'7, (claim 1 change "petal" to --metal--.

Signed and sealed this l th day of January 1972.

(SEAL) Attest:

EDWARD M.FLETCHER, JR. ROBERT GOTTSCHALK Attesting Officer ActingCommissionerof Patents

1. In a method of providing a suspended roof construction, assembling atleast a pair of slotted refractory tile members in an aligned positionwith respect to each other, inserting a hanger casting in the slots ofthe aligned tile members to project therefrom, inserting loose metalreinforcing plates between the aligned tile members, banding the alignedtile members as a group together with the petal plates in position andwith the associated hanger casting within the slots to form a secureassembly, and providing asbestos members between the tile members andthe metal plates before banding the tile members together as a group. 2.In a method of providing a suspended roof construction, assemblingslotted refractory tile members with their slotted portions in acooperating relation with respect to each other, inserting hangercastings within cooperating slotted portions of the assembled tilemembers to project endwise therefrom, inserting loose metal reinforcingplates between the assembled tile members, banding assembled tilemembers together in the form of groups with the metal plates and thehanger castings in position to form secure assemblies, and employing anexpansion-permitting means by applying an asbestos sheathing and anouter metal enclosure about each banded group of tile members beforebanding the group and assembling it on the pallet.
 3. In a panelizedsuspended roof construction for removable mounting between an adjacentpair of spaced-apart overhead girders, metal hangers, aligned rows ofhanger-supported refractory tile members, reinforcing metal platesbetween the tile members of said rows, means banding groups of the tilemembers of said rows together with said metal plates in a secureposition therebetween, metal support members cooperating with saidhangers to removably suspend said rows between the girders, said platemembers having members along side and bottom portions of the tilemembers of said banded groups, and asbestos sheathing between said platemembers and side and bottom portions of tile members of said bandedgroups.
 4. In a panelized suspended roof construction for removablemounting between an adjacent pair of spaced-apart cross-extendingoverhead girders, a pair of longitudinally spaced-apart primary panelsand an intermediate secondary panel of metal-supported and suspendedrefractory tile members; each primary panel being of similarconstruction and being suspended from an associated one of the girders;Each primary panel having a two-part construction, each part of whichhas transversely extending rows of hanger-mounted refractory tilemembers suspended from a transversely extending channel member, eachpart also having a vertically upwardly and horizontally inwardlyprojecting metal supporting frame secured to said channel member, saidsupporting frame of one part of said pair being adapted to extendtowards the associated girder and to removably rest upon an adjacentbottom flange and extend from one side of the rib thereof, saidsupporting frame of the other part of the same pair being adapted toextend towards and rest upon an adjacent bottom flange of the sameassociated girder from an opposite side of its rib and in an opposedrelation with respect to said first-mentioned frame; said secondarypanel having transversely extending rows of hanger-mounted refractorytile members suspended from spaced-apart transversely extending channelsand having an overhead metal frame that is secured to and projectsupwardly from the channels and that projects horizontally outwardly atan upper level to rest upon said pair of primary panels that are locatedat opposite ends of said secondary panel and suspended from the pair ofspaced-apart girders.
 5. In a roof as defined in claim 4, said overheadmetal frame of said secondary panel having at least a pair ofspaced-apart horizontally extending overhead support members that areconnected by spaced-apart vertical leg members to the channels of eachof the rows of sad secondary panel.
 6. In a panelized suspended roofconstruction for removable mounting on an adjacent pair oflongitudinally spaced-apart cross-extending overhead girders, a pair ofspaced-apart end panels comprising hanger-suspended refractory tilemember rows, each end panel of said pair being in alignment with andsupported on an associated one of the girders, an intermediate panelhaving hanger-suspended refractory tile member rows carried by verticalupright members and horizontally extending members that define asupporting frame, said horizontal members of said supporting framehaving end portions that are removably supported on and with respect tothe pair of cross-extending girders, said intermediate panel having anupwardly open and horizontally extending channel for each of its tilemember rows, and the hanger castings of each tile member row beingmounted in an endwise-insertable removably suspended relation on anassociated one of said channels.
 7. In a roof construction as defined inclaim 6, the vertical upright members of said supporting frame of saidintermediate panel being spaced-apart upright metal members secured attheir lower ends to said horizontal channel members, and saidhorizontally extending members of said supporting frame being overheadlongitudinally extending and spaced-apart metal suspension members towhich upper ends of said vertical upright members are secured and whichat their ends are suspended from the pair of adjacently spaced-apartgirders.
 8. In a panelized suspended roof construction, a plurality ofrefractory tile member rows in an aligned group, hanger castingssuspending each tile member row, a transversely extending channel memberslidably receiving the hanger castings of each tile member row, anoverhead metal support structure suspending said tile member rows in anassembled relation, upper reaches of said hanger castings and of saidchannel members being in a substantially planar-aligned position alongthe construction, cover plate members positioned over said channelmembers and said hanger castings to seal-off upper reaches of the hangercastings and the tile members and to define a cooling air circulatingspacing between upper reaches of said hanger castings and upper reachesof said tile member rows, and means for moving cooling air beneath saidplate members along the upper reaches of said tile member rows.
 9. In apanelized roof construction as defined in claim 8, means cooperatingwith said cover plAte members for directing the moving cooling air fromone side of the roof construction to the opposite side thereof.
 10. In aroof construction as defined in claim 8, said plate members beingpositioned in a relatively planar relationship with respect to eachother to receive spilled dust and additives thereon for ready removalfrom the construction above said hanger castings and said tile memberrows.
 11. In a roof construction as defined in claim 8, spaced-apartupright metal members secured at their lower ends to said channelmembers, and overhead horizontally extending spaced-apart suspensionmembers secured to the upper ends of said upright metal members.
 12. Ina roof construction as defined in claim 11, means defining compartmentsalong the upper reaches of said refractory tile member rows transverselyof the construction and substantially parallel to said channel members,and means for introducing cooling fluid into alternate compartmentstaken longitudinally of the construction from opposite sides of theconstruction and for removing warmed cooling fluid after it has passedacross the roof construction from alternate compartments along oppositesides thereof.
 13. In a quick servicing panel construction for repairinga furnace roof, a longitudinal row of a banded together group ofrefractory tile members having slotted upper end portions, hangercastings mounted in said slotted portions and projecting upwardly in analigned relation along the row, a slide-in channel member inserted alongand engaged by the aligned hanger castings, an overhead support frameadapted to be suspended from an overhead hoist, said support framehaving at least a pair of spaced-apart vertical legs secured at theirlower ends to said channel member, a cross-extending member projectingthrough said pair of legs in alignment with said channel member, andwedge-shaped members driven between opposite end portions of saidcross-extending end member and immediately adjacent hanger castings tosecurely suspend said rows from said support structure fortransportation to and insertion within an open portion of the roof thatis to be repaired. 14 In an improved hot patching refractory tile memberconstruction, an endwise-aligned group of upright refractory tilemembers having wide side faces and narrow end faces, asbestosangle-shaped members enclosing outer wide side and end faces of thegroup as well as bottom faces thereof, and metal sheath membersenclosing said asbestos members.
 15. In a construction as defined inclaim 14, said asbestos members comprising a pair of angle-shaped sidemembers, each having a vertical portion of a height and lengthsubstantially corresponding to the height and length of wide sides ofthe group and having a horizontal bottom portion of a length and widthsubstantially corresponding to the length and width of an underside ofthe group, and said asbestos members also comprising a pair ofangle-shaped end members having a vertical portion of a height and widthsubstantially corresponding to the height and width of narrow ends ofthe group and having a horizontal bottom portion of a widthsubstantially corresponding to the width of an underside of the groupand of a length substantially corresponding to one half the length ofthe underside.
 16. In a construction as defined in claim 14, said metalsheath members comprising a U-shaped metal member having a bottomhorizontal portion of a length and width substantially corresponding tothe length and width of an underside of the group and having verticalend portions extending from ends of said horizontal portion, each havinga height and width substantially corresponding to the height and widthof narrow ends of the group; and a rectangular-shaped metal memberhaving a pair of opposed vertical wide side portions of height andlength substantially corresponding to the height and length of opposedwide sides of the group, having a horizontal bottom portion connectingbottom edges of said pair of vertical wide side portions and of a lengthand width substantially corresponding to the length and width of anunderside of the group, and having a pair of horizontal upper tabportions connected to upper ends of said wide side portions and of alength substantially corresponding to the length of an upper side of thegroup and of a lesser width than the upper side of the group.
 17. In animproved cold patching refractory tile assembly, aligned rows ofrefractory tile members each of which has a pair of wide side faces anda pair of narrow end faces, each tile member having a latching slotportion at an upper end thereof, matching pairs of the tile membershaving their slot portions in a cooperating complementary group, eachcomplementary group of slot portions having a hanger casting mountedtherein and extending across the aligned tile rows to projectthereabove, said aligned rows comprising at least one pair of said tilemembers positioned with their adjacent wide side faces in an opposedrelation with respect to each other, vertically extending metalseparating plates of planar construction between the opposed wide sidefaces of each said pair of tile members, angle-shaped verticallyupwardly extending metal sheath members each having one side closing offnarrow end faces of the pair of tile members and having its other sideclosing-off and extending along an outer wide side face of said pair,and metal banding strip means about the aligned rows of said tilemembers to hold said metal plate and sheath members in position and saidtile members in an assembled relation.